core_timing: Sleep in discrete intervals, yield during spin
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658e1ee426
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606cdb17d3
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@ -281,20 +281,21 @@ void CoreTiming::ThreadLoop() {
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paused_set = false;
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const auto next_time = Advance();
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if (next_time) {
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// There are more events left in the queue, sleep until the next event.
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const auto diff_ns{*next_time - GetGlobalTimeNs().count()};
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if (diff_ns > 0) {
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// Only try to sleep if the remaining time is >= 1ms. Take off 500 microseconds
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// from the target time to account for possible over-sleeping, and spin the
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// remaining.
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const auto sleep_time_ns{diff_ns - 500LL * 1'000LL};
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const auto sleep_time_ms{sleep_time_ns / 1'000'000LL};
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if (sleep_time_ms >= 1) {
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event.WaitFor(std::chrono::nanoseconds(sleep_time_ns));
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// There are more events left in the queue, wait until the next event.
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const auto wait_time = *next_time - GetGlobalTimeNs().count();
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if (wait_time > 0) {
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// Assume a timer resolution of 1ms.
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static constexpr s64 TimerResolutionNS = 1000000;
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// Sleep in discrete intervals of the timer resolution, and spin the rest.
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const auto sleep_time = wait_time - (wait_time % TimerResolutionNS);
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if (sleep_time > 0) {
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event.WaitFor(std::chrono::nanoseconds(sleep_time));
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}
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const auto end_time{std::chrono::nanoseconds(*next_time)};
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while (!paused && !event.IsSet() && GetGlobalTimeNs() < end_time) {
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while (!paused && !event.IsSet() && GetGlobalTimeNs().count() < *next_time) {
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// Yield to reduce thread starvation.
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std::this_thread::yield();
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}
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if (event.IsSet()) {
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